Pokemon number 123 is Scyther. Scyther is a bug and flying type Pokemon with swarm and technician abilities that evolves into Scizor.
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The Pokemon 123 in leaf green is scyther, i think you can get it by trading it from fire red...
Scyther
Yes you can trade leafgreen version Pokemon to another leafgreen version.
you find delibird in island number 4 in the snow caveDelibird is uncatchable in leafgreen get one from firered.
On Pokemon Pearl's title screen, if the Pokemon LeafGreen game is in the GBA slot, click on "Transfer From LeafGreen" and you can choose six Pokemon from LeafGreen to transfer to Pearl, but be careful-you can't trade them back.